Year	%
2000	25.9
2001	25.6
2002	25.3
2003	25.1
2004	25
2005	24.8
2006	24.6
2007	24.3
2008	24.1
2009	23.8
2010	23.6
2011	23.5
2012	23.4
2013	23.3
2014	23.3
2015	23.2
2016	23.2
2017	23.1
2018	23.2
2019	23.2